I have some old Delhi Sultanate coins issued by the Tughlak sultans.
This coin was issued by Muhammad Bin Tughlak during 1325AD-1351AD. It is of denomination “One Paika”. It can be found in the coins catalog at Sr No D394.
In March 2013, I obtained another piece of this coin.
An image of Muhammad Bin Tughlaq
The next two coins are identical coins of denomination “Four Ghani”. These were issued by King Ghiyas-ud-Din Tughlak during 1320AD-1325AD.This coin is of “Abu al-Muzaffar” type and features in the Coins catalog at Sr Number D311.
The next coin is a falus of 40 rati standard of Firuz Shah Tughluq, Sultan of Delhi (752-90 AH) / Delhi mint
legend is : Firuz Shah Sultan (from up to bottom) / reverse: dar-al mulkh Delhi
ref Goron D491.
Tughlaqabad Fort , Delhi lies in ruins. The mausoleum of Ghias-ud-Din Tughlaq is better maintained.